Mechanical Engineering MCQs

Page No. 6

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?


aincreases


bdecreases


cremains unaffected


dfirst increases and then decreases


View Answer decreases

During storage, the heating value of coal __________________?


aincreases


bdecreases


cremains constant


dmay increase or decrease depending upon the method of storage


View Answer decreases

Film boling occurs at _______________________?


avery low pressure


batmospheric pressures


cmedium pressures


dvery high pressures


View Answer very high pressures

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?


amore heating surface


bless heating surface


cequal heating surface


dheating surface depends on other parameters


View Answer more heating surface

The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?


aincreases


bdecreases


cremains unchanged


dincreases/decreases depending on steam temperature requirements


View Answer decreases

The basic job of feed water treatment in boilers is to overcome the problem of __________________?


acorrosion


bscale


ccarryover


dall of the above


View Answer all of the above

The feed check valve is used in order to ______________________?


aregulate flow of boiler water


bcheck level of water in boiler drum


crecirculate unwanted feed water


dallow high pressure feed water to flow to drum and not allow reverse flow to take place



In water wall furnace, the heat is transferred to the water-walls by _________________?


aconvection


bradiation


cconduction


dradiation and conducton


View Answer radiation

Fire tube boilers are limited to a maximum design working pressure of ____________________?


a1 kg/cm


b6 kg/cm


c17 kg/cm2


d100 kg/cm2


View Answer 17 kg/cm2

The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?


aincreases


bdecreases


cremains unaffected


dfirst increases and then decreases


View Answer decreases

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